Patent GB-248702-A (GB)
Title: Improved means for actuating die casting machines
IPC: B22D17/14
Filed: 1925-10-28
Abstract: 248,702. Madison-Kipp Corporation, (Assignees of Korsmo, T. C.). March 6, 1925, [Convention date]. Casting-machines; metal-pouring; castings, extracting; coating moulds and cores.-A die-casting machine has automatic means for closing, charging and opening the die and for ejecting the casting all operated in timed relation and continuously for a number of cycles. The cam-shaft 29 is driven by a motor 9 and gearing in cases 16, 26 through a clutch 24 which is opened, after each cycle by a projection 207, on a connecting-rod 53 coming into engagement with the clutchoperating rod 200. To close the clutch the rod 200 must first be raised by the pedal 205 and then moved to the left by handle 206. For continuous working the pedal 205 is held down by foot or a catch. The shaft 29 carries, at each end, a cam 209 and stud 55 adapted to engage a stud 213 and slot 54, respectively, of the connecting-rod 53 which thus reciprocates a rod 50. Nuts 135 and springs 136 on the rods 50, during their movement to the left, slide the support 127 of mould half 128 along guide rods 42 carried by a plate 41 and casing 26 which are mounted on yokes 38, 18 capable of being withdrawn along rods 7 for replacement of the dies &c. but normally held by bolts 20. During the advance of the mould 128 an ejector pin 140, Fig. 4, is withdrawn and a plate 149 and core 154 is advanced by levers 143, 151, and 155 actuated by fixed cams 147, 162, and 161. The rods 50 also engage catches 110 on a slide 104 connected by a yoke 102 to a piston 87 which is thus moved to the left in its cylinder 86 compressing springs 108. Towards the end of the stroke of the rods 50 pins 124 thereon operate levers 48 to raise a slide 67 and a pressure chamber 76 from the melting pot 34 and press its nozzles 84, 81 the former against an outlet 85 of the cylinder 86 and the latter agamst a freely suspended, plate 163 and the now-closed mould. Adjustable stops 118 then release the catches 110 as shown in Fig. 11, from the moving rods 50, the springs 108 force the piston rapidly to the right thus blowing a charge of molten metal into the mould, risk of air entering the mould being reduced by a deflector 195, Fig. 4. The cam 209 is shaped to allow the rods 50 to remain stationary while the metal cools and then make the return stroke during which the parts are returned to their original position and the casting is ejected. The left hand end of the cylinder is connected, through an adjustable capacity 172, pipes 178, and two lubricators 179 or powder distributors, to the fixed mould cavity to blow lubricant or powder into the mould before casting and to withdraw air during casting. The air withdrawn may pass into the cylinder via a lubricant spraying device or direct if charged with lubricant by the device 19. When the yokes 18, 38 are released and moved to the right on the rods 8, the pins 83 on the pressure chamber merely pass out of engaging slots 74 in the slide 67 and the chamber can be removed by withdrawing its pivot pin 78. The cylinder 86 &c. is slidably mounted on a support 96 and pressed to the right by springs 100 and the support 96 is carried by two pins 90 either of which may be withdrawn to allow the whole to be turned about the other. The lubricant spraying devices 179 may be arranged on the plate 41 and on either side of the mould half 126. Each device has a nozzle 187, Fig. 12, connected to the pipe 178 and a screwoperated valve 193 to regulate the quantity of oil drawn up the feed tube 186. The pressure chamber 76 has fins 196 to remove dross from the surface of the metal where the nozzle 81 submerges. Specification 258,265 is referred to. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a modification according to which the plate 168 is carried by four pins 171. Fig. 17, (Cancelled), in slots of a frame 169. This subject-matter does not appear in the Specification as accepted.